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0000000..0ffac8b --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "svc16" +version = "0.1.0" +edition = "2021" +authors = ["Jan Neuendorf"] +description = "An emulator for a simple virtual computer" +license="MIT" + +[dependencies] +anyhow = "1.0.93" +clap = { version = "4.5.21", features = ["derive"] } +minifb = "0.27.0" +thiserror = "2.0.3" diff --git a/src/cli.rs b/src/cli.rs new file mode 100644 index 0000000..e707d1d --- /dev/null +++ b/src/cli.rs @@ -0,0 +1,34 @@ +use clap::Parser; + +#[derive(Parser, Debug)] +#[command(author, version, about, long_about = None)] +pub struct Cli { + pub program: String, + + #[arg(short, long, default_value = "1", help = "Set the window scaling")] + pub scaling: usize, + + #[arg( + short, + long, + default_value = "3000000", + help = "Set the maximum instructions per frame" + )] + pub max_ipf: usize, + + #[arg( + short, + long, + default_value_t = false, + help = "Output performance metrics" + )] + pub verbose: bool, + #[arg( + short, + long, + help = "Output instructions and value at the given address" + )] + pub debug: Option>, + #[arg(short, long, help = "Show cursor on window")] + pub cursor: bool, +} diff --git a/src/engine.rs b/src/engine.rs new file mode 100644 index 0000000..ce35a33 --- /dev/null +++ b/src/engine.rs @@ -0,0 +1,196 @@ +use std::ops::{BitAnd, BitXor}; +use thiserror::Error; + +const MEMSIZE: usize = u16::MAX as usize + 1; + +const SET: u16 = 0; +const GOTO: u16 = 1; +const SKIP: u16 = 2; +const ADD: u16 = 3; +const SUB: u16 = 4; +const MUL: u16 = 5; +const DIV: u16 = 6; +const CMP: u16 = 7; +const DEREF: u16 = 8; +const REF: u16 = 9; +const INST: u16 = 10; +const PRINT: u16 = 11; +const READ: u16 = 12; +const BAND: u16 = 13; +const XOR: u16 = 14; +const SYNC: u16 = 15; + +pub struct Engine { + memory: [u16; MEMSIZE], + screen: [u16; MEMSIZE], + instruction_pointer: u16, + pos_code: u16, + key_code: u16, + sync_called: bool, +} + +#[derive(Debug, Error)] +pub enum EngineError { + #[error("Division by zero")] + ZeroDivision, + + #[error("Invalid instruction")] + InvalidInstruction, +} + +impl Engine { + pub fn new(state: T) -> Self + where + T: IntoIterator, + { + let mut iter = state.into_iter(); + let mut memory = [0_u16; MEMSIZE]; + for i in 0..MEMSIZE { + match iter.next() { + Some(val) => { + memory[i] = val; + } + _ => { + break; + } + } + } + Self { + memory, + screen: [0; MEMSIZE], + instruction_pointer: 0, + pos_code: 0, + key_code: 0, + sync_called: false, + } + } + pub fn wants_to_sync(&self) -> bool { + return self.sync_called; + } + pub fn get_instruction_pointer(&self) -> u16 { + self.instruction_pointer + } + pub fn set_input(&mut self, pos_code: u16, key_code: u16) { + self.pos_code = pos_code; + self.key_code = key_code; + } + pub fn perform_sync(&mut self, pos_code: u16, key_code: u16) -> [u16; MEMSIZE] { + self.set_input(pos_code, key_code); + self.sync_called = false; + return self.screen.clone(); + } +} +impl Engine { + pub fn get(&self, index: u16) -> u16 { + return self.memory[index as usize]; + } + fn set(&mut self, index: u16, value: u16) { + self.memory[index as usize] = value; + } + fn get_screen(&self, index: u16) -> u16 { + return self.screen[index as usize]; + } + fn set_screen(&mut self, index: u16, value: u16) { + self.screen[index as usize] = value; + } + pub fn read_instruction(&self) -> [u16; 4] { + return [0, 1, 2, 3].map(|o| self.get(self.instruction_pointer.wrapping_add(o))); + } + fn advance_inst_ptr(&mut self) { + self.instruction_pointer = self.instruction_pointer.wrapping_add(4); + } + pub fn step(&mut self) -> Result<(), EngineError> { + let [opcode, arg1, arg2, arg3] = self.read_instruction(); + match opcode { + SET => { + self.set(arg1, arg2); + self.advance_inst_ptr(); + } + GOTO => { + if self.get(arg3) == 0 { + self.instruction_pointer = self.get(arg1).wrapping_add(arg2); + } else { + self.advance_inst_ptr(); + } + } + SKIP => { + if self.get(arg3) == 0 { + self.instruction_pointer = self + .instruction_pointer + .wrapping_add(arg1.wrapping_mul(4).wrapping_sub(arg2.wrapping_mul(4))); + } else { + self.advance_inst_ptr(); + } + } + ADD => { + self.set(arg3, self.get(arg1).wrapping_add(self.get(arg2))); + self.advance_inst_ptr(); + } + SUB => { + self.set(arg3, self.get(arg1).wrapping_sub(self.get(arg2))); + self.advance_inst_ptr(); + } + MUL => { + self.set(arg3, self.get(arg1).wrapping_mul(self.get(arg2))); + self.advance_inst_ptr(); + } + DIV => { + if self.get(arg2) == 0 { + return Err(EngineError::ZeroDivision); + } else { + self.set(arg3, self.get(arg1).wrapping_div(self.get(arg2))); + self.advance_inst_ptr(); + } + } + CMP => { + if self.get(arg1) < self.get(arg2) { + self.set(arg3, 1); + } else { + self.set(arg3, 0); + } + self.advance_inst_ptr(); + } + DEREF => { + let value = self.get(self.get(arg1) + arg3); + self.set(arg2, value); + self.advance_inst_ptr(); + } + REF => { + let value = self.get(arg2); + self.set(self.get(arg1) + arg3, value); + self.advance_inst_ptr(); + } + INST => { + let value = self.instruction_pointer; + self.set(arg1, value); + self.advance_inst_ptr(); + } + PRINT => { + self.set_screen(self.get(arg2), self.get(arg1)); + self.advance_inst_ptr(); + } + READ => { + self.set(arg2, self.get_screen(self.get(arg1))); + self.advance_inst_ptr(); + } + BAND => { + let band = self.get(arg1).bitand(self.get(arg2)); + self.set(arg3, band); + self.advance_inst_ptr(); + } + XOR => { + let xor = self.get(arg1).bitxor(self.get(arg2)); + self.set(arg3, xor); + self.advance_inst_ptr(); + } + SYNC => { + self.sync_called = true; + self.set(arg1, self.pos_code); + self.set(arg2, self.key_code); + self.advance_inst_ptr(); + } + _ => return Err(EngineError::InvalidInstruction), + } + Ok(()) + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..8938fbc --- /dev/null +++ b/src/main.rs @@ -0,0 +1,120 @@ +mod cli; +mod engine; + +use anyhow::{anyhow, Result}; +use clap::Parser; +use cli::Cli; +use engine::Engine; +use minifb::{Key, Scale, Window, WindowOptions}; +use std::time::Instant; +const RES: usize = 256; + +fn main() -> Result<()> { + let cli = Cli::parse(); + let initial_state = read_u16s_from_file(&cli.program)?; + let mut engine = Engine::new(initial_state); + let mut options = WindowOptions::default(); + + options.scale = match cli.scaling { + 1 => Scale::X1, + 2 => Scale::X2, + 4 => Scale::X4, + 8 => Scale::X8, + 16 => Scale::X16, + _ => return Err(anyhow!("Scaling must be 1,2,4,8 or 16")), + }; + + let mut image_buffer = vec![0_u32; RES * RES]; + let mut window = Window::new("SVC16", RES, RES, options)?; + window.set_target_fps(30); + window.set_cursor_visibility(cli.cursor); + while window.is_open() && !window.is_key_down(Key::Escape) { + let mut ipf = 0_usize; + let start = Instant::now(); + while !engine.wants_to_sync() { + if let Some(debug_vals) = &cli.debug { + print_debug_info(debug_vals, &engine); + } + engine.step()?; + ipf += 1; + if ipf >= cli.max_ipf { + break; + } + } + let frametime = start.elapsed(); + let input_code = get_input_code(&window); + let screenview = engine.perform_sync(input_code.0, input_code.1); + update_image_buffer(&mut image_buffer, &screenview); + window.update_with_buffer(&image_buffer, RES, RES)?; + if cli.verbose { + println!( + "frame needed {} instructions ({}ms)", + ipf, + frametime.as_millis() + ); + } + } + Ok(()) +} + +fn read_u16s_from_file(file_path: &str) -> Result> { + use std::io::{BufReader, Read}; + let file = std::fs::File::open(file_path)?; + let mut reader = BufReader::new(file); + let mut buffer = [0u8; 2]; + let mut u16s = Vec::new(); + while reader.read_exact(&mut buffer).is_ok() { + let value = u16::from_le_bytes(buffer); + u16s.push(value); + } + Ok(u16s) +} + +fn rgb565_to_argb(rgb565: u16) -> u32 { + let r = ((rgb565 >> 11) & 0x1F) as u8; + let g = ((rgb565 >> 5) & 0x3F) as u8; + let b = (rgb565 & 0x1F) as u8; + let r = (r << 3) | (r >> 2); + let g = (g << 2) | (g >> 4); + let b = (b << 3) | (b >> 2); + (0xFF << 24) | ((r as u32) << 16) | ((g as u32) << 8) | (b as u32) +} + +fn update_image_buffer(imbuff: &mut Vec, screen: &[u16; RES * RES]) { + for i in 0..RES * RES { + *imbuff.get_mut(i).expect("Error with image buffer") = rgb565_to_argb(screen[i]); + } +} + +fn get_input_code(window: &Window) -> (u16, u16) { + let mp = window.get_mouse_pos(minifb::MouseMode::Clamp).unwrap(); + let pos_code = mp.1 as u16 * 256 + mp.0 as u16; + let mut key_code = 0_u16; + if window.get_mouse_down(minifb::MouseButton::Left) { + key_code += 1; + } + if window.get_mouse_down(minifb::MouseButton::Right) { + key_code += 2; + } + + (pos_code, key_code) +} + +fn print_debug_info(debug_vals: &Vec, engine: &Engine) { + let ptr = engine.get_instruction_pointer(); + let inst = engine.read_instruction(); + for d in debug_vals { + println!("@{}={}", d, engine.get(*d)); + } + println!( + "prt:{}, opcode:{}, args:[{},{},{}], @args:[{},{},{}]", + ptr, + inst[0], + inst[1], + inst[2], + inst[3], + engine.get(inst[1]), + engine.get(inst[2]), + engine.get(inst[3]) + ); +}